[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.804262] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.254262] random: sshd: uninitialized urandom read (32 bytes read) [ 20.707367] random: sshd: uninitialized urandom read (32 bytes read) [ 21.246511] random: sshd: uninitialized urandom read (32 bytes read) [ 34.467830] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.3' (ECDSA) to the list of known hosts. [ 39.962099] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 40.040148] BUG: unable to handle kernel paging request at ffffeafff9140020 [ 40.047526] IP: [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 40.053792] PGD 0 [ 40.055742] [ 40.057370] Oops: 0000 [#1] PREEMPT SMP KASAN [ 40.061843] Dumping ftrace buffer: [ 40.065416] (ftrace buffer empty) [ 40.069111] Modules linked in: [ 40.072402] CPU: 1 PID: 3807 Comm: syz-executor759 Not tainted 4.9.122-g54068d6 #78 [ 40.080172] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.089503] task: ffff8801b6b06000 task.stack: ffff8801d9058000 [ 40.095537] RIP: 0010:[<ffffffff814f5937>] [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 40.104211] RSP: 0018:ffff8801d905f948 EFLAGS: 00010246 [ 40.109710] RAX: dffffc0000000000 RBX: ffffeafff9140000 RCX: 0000000000000000 [ 40.117009] RDX: 1ffffd5fff228004 RSI: ffffffff814f5918 RDI: ffffeafff9140000 [ 40.124266] RBP: ffff8801d905f970 R08: 00000000000342a0 R09: 0000000000000001 [ 40.131512] R10: ffff8801b6b06000 R11: 0000000000000001 R12: ffff8801d905fc08 [ 40.138770] R13: ffffeafff9140020 R14: ffffeafff9140000 R15: 0000000000000001 [ 40.146020] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 40.154223] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 40.160092] CR2: ffffeafff9140020 CR3: 00000001c4191000 CR4: 00000000001606f0 [ 40.167341] Stack: [ 40.169474] ffffeafff9140020 ffff8801d905fc08 ffff8801c2c08800 ffffeafff9140000 [ 40.177501] ffff8801b6079478 ffff8801d905f9c8 ffffffff8154cb8f ffff8801d905fc18 [ 40.185501] ffff8801d905fc10 ffff8801d905fc88 00003ffe450001e0 00000001c2c08000 [ 40.193499] Call Trace: [ 40.196065] [<ffffffff8154cb8f>] zap_huge_pmd+0x16f/0x860 [ 40.201672] [<ffffffff814cae6d>] unmap_page_range+0x12ad/0x1730 [ 40.207934] [<ffffffff814c9bc0>] ? vm_normal_page_pmd+0x310/0x310 [ 40.214234] [<ffffffff814cb3f1>] unmap_single_vma+0x101/0x260 [ 40.220292] [<ffffffff814cbd32>] unmap_vmas+0x102/0x1d0 [ 40.225722] [<ffffffff814e4834>] exit_mmap+0x214/0x3f0 [ 40.231176] [<ffffffff814e4620>] ? SyS_munmap+0xa0/0xa0 [ 40.236613] [<ffffffff8122e58a>] ? up_write+0x1a/0x60 [ 40.241869] [<ffffffff8112db23>] mmput+0xf3/0x2d0 [ 40.246779] [<ffffffff81143056>] do_exit+0x906/0x27b0 [ 40.252151] [<ffffffff81142750>] ? release_task.part.19+0x1210/0x1210 [ 40.258792] [<ffffffff8122e58a>] ? up_write+0x1a/0x60 [ 40.264055] [<ffffffff814ece0d>] ? do_mprotect_pkey+0x71d/0x890 [ 40.270179] [<ffffffff814ec6f0>] ? mprotect_fixup+0x930/0x930 [ 40.276133] [<ffffffff81149211>] do_group_exit+0x111/0x340 [ 40.281824] [<ffffffff81149440>] ? do_group_exit+0x340/0x340 [ 40.287684] [<ffffffff8114945d>] SyS_exit_group+0x1d/0x20 [ 40.293290] [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 [ 40.298988] [<ffffffff83a00cd3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 40.305948] Code: 55 41 54 53 48 89 fb e8 58 b4 e6 ff 4c 8d 6b 20 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 00 0f 85 b8 05 00 00 <4c> 8b 73 20 49 89 dc 41 f6 c6 01 0f 85 4b 03 00 00 e8 23 b4 e6 [ 40.333234] RIP [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 40.339623] RSP <ffff8801d905f948> [ 40.343242] CR2: ffffeafff9140020 [ 40.346672] ---[ end trace eac85de1e2053a1b ]--- [ 40.351424] Kernel panic - not syncing: Fatal exception [ 40.357154] Dumping ftrace buffer: [ 40.360680] (ftrace buffer empty) [ 40.364393] Kernel Offset: disabled [ 40.367997] Rebooting in 86400 seconds..